Terminal coupling for well strainers



March 6, 1934. G. E. WILLERS TERMINAL COUPLING FOR WELL STRAINERS FiledJune 20, 1932 PGL L ATTORNEYS Patented Mar. 6, 1934 PATENT OFFIQE 7TERMINAL COUPLING FOR WELL STRAINERS George E. Willers, Lawrenceburg,Ind., assignor to A. 1). Cook, Inc., Lawrenceburg, Ind., a corporationof Indiana Application June 20, 1932, Serial No. 618,280

12 Claims.

My invention relates to terminal couplings for deep well strainers, inwhich coupling members are provided with means for attachment to othersuitable connections and as end supports for well strainers. In myPatent No. 1,862,838, of June 14th, 1932, I have described a wellstrainer and coupling with a ring inside the strainer for use with astrainer coupling, which is required to be flush with the outside of thestrainer.

It often becomes desirable for the driller of a well to develop the wellby means of working a close fitting plunger inside of the strainer. Thismakes the use of a strainer having internal flanges or ringsundesirable.

15 It is, therefore, the object of my invention to provide a strainercoupling in which the inside diameter of the strainer and coupling willbe uniorm throughout its entire length.

Another object of my invention is to provide a 2 strainer of uniforminside diameter in which the ends of the helical strainer wires areprotected on the outside.

Another object is the provision of a coupling in which reinforcement isprovided for the bar sup- 5 porting the strainer windings by means ofsegmental plates wedged between the supporting bars, thereby providing astrong and durable strainer assembly.

Referring to the drawing, in which I have illustrated a preferred typeof construction embodying the principle of my invention:

Figure 1 is a side elevation with parts in section.

Figure 2 is a cross section along the lines 22 of Figure 1.

I have indicated a plurality of supporting bars 1 which have square cutthreads 2 which extend around the bars in a spiral direction. Windings 3are placed in the notched threads, and the windings may be securedwithin the threads by calking, welding or soldering.

The ends of the bars 1 project beyond the end of the winding wire, butthe square notched thread is continued throughout the length of thebars, as indicated at 4. A terminal coupling 5 is internally threaded asindicated at 6, with threads which match the spiral thread in thesupporting bars 1, so that the coupling may be threaded in the positionas indicated in Figure 1.

Pieces '7 of segmental shape are fitted between the side edges of thebars 1, so that they provide a brace extending between the bars. Thepieces '7 are so fitted between the bars that they will not projectbeyond the inner faces of the bars nor beyond the bottom of the notchedthread 4 on the outer faces of the bars 1.

When the terminal coupling 5 is secured in position it has a recessedflanged portion 8 which extends down over the first one or two windingsof the screen wire 3.

After assembling the reinforcing segments '7 between the ends of thebars 1, and after assembling these parts within the terminal coupling 5,the whole assembly is sweated in thus firmly 6 attaching the terminalcouplings to the ends of the strainer.

It will be observed that with this construction there will be noshoulders on the inside of the strainer, and the inside diameter will beuniform throughout its entire length, so that a closefitting plunger maybe worked inside of the strainer.

It will further be noted that the end of the winding wire is protectedon the outside by means of the internally recessed flange 8.

Having thus described my invention, what I claim as new and desire tosecure by Letters Patent, is:-

1. In combination, a well strainer having circumferentially spaced barswith helically wound wire secured externally of said bars and havingarcuate reinforcing pieces secured therein and extending between thebars, a coupling having an internally flanged recess into which saidbars extend, the inner surfaces of the bars, the inner surfaces of thereinforcing pieces and the inner surface of the coupling lying in thesame cylindrical surface.

2. In combination, a well strainer having circumferentially spaced barswith helically wound wire secured externally of said bars and havingarcuate reinforcing pieces secured therein and extending between thebars, a coupling having an internally flanged recess into which saidbars extend, the inner surfaces of the bars, the inner surfaces of thereinforcing pieces and the inner surface of the coupling lying in thesame cylindrical surface, and said coupling, bars and pieces joined intoan integral self-sustaining assembly.

3. In combination, a well strainer having circumferentially spaced barsand having arcuate reinforcing pieces secured therein and extendingbetween the bars, a coupling having an internally flanged recess intowhich said bars extend, the inner surfaces of the bars, the innersurfaces of the reinforcing pieces and the inner surface of the couplinglying in the same cylindrical surface, said bars being providedexternally with threads, and helically wound wire seated within saidthreads.

4. In combination, a well strainer having circumferentially spaced barsand having arcuate reinforcing pieces secured therein and extendingbetweenthe bars, a coupling having an internally flanged recess intowhich saidbars extend, the inner surfaces of the bars, the innersurfaces of-the reinforcing pieces and the inner surface of the couplinglying in the same cylindrical surface, said bars being providedexternally with threads, and helically wound wire. seated". within saidthreads, portions of said bars extending be'-- yond the end of thehelically wound wire having continuations of the threads in saidportions, andl said coupling having threads engaging said threads ofsaid bar portions.

5. In combination, a well strainer having circumferentially spaced barsand having arcuate reinforcing pieces secured therein and extendingbetween the bars, a coupling; having an internally flanged recess intowhich said bars extend, the inner surfaces of the bars, the innersurfaces of the reinforcing pieces andthe inner surface of the couplinglying in the same cylindrical surface, said bars being providedexternally with threads, and helically wound wire seated within saidthreads, said coupling having an annular recessed portion housing theend turns of the Wire.

6. In combination, a well strainer having circumferentially spaced barsand having arcuate reinforcing pieces secured therein and extendingbetween the bars, a coupling having an internally flanged recess intowhich said bars extend, the inner surfaces of the bars, the innersurfaces of the reinforcing pieces and the inner surface of the couplinglying in the same cylindrical surface, said bars being providedexternally with threads, and helically wound wire seated within saidthreads, said coupling having an annular recessed portion housing theend turns of the wire, the outer surfaces of said reinforcing pieceslying in the same cylindrical surface as theinner surfaces of thethreads in the bars. i r

7. In combination, a well strainer having circumferentially spaced barsand having arcuate reinforcing pieces secured therein and extendingbetween the bars, a coupling having an internally flanged recess intowhich. said bars extend, the inner surfaces of the bars, the inn-ersurfaces of the reinforcing pieces and the inner surface of the couplinglying in the same cylindrical surface, said bars being providedexternally with 3 threads, and helically woundwire seated. within saidthreads, said coupling having, an annular recessed portion housing theend turns of. the wire, the thickness of the reinforcing pieces beingequal to the distance from the base of the threads inthe rods to theinner surfaces of said rods.

8. In combination witha well strainer having supporting bars and wirewound and secured out-' side the bars in a helical formation, an endcoupling piece having an internal annular recess receiving the ends ofthe bars in the internal bore thereof and arcuate reinforcing piecesextending between sides of said bars, the depth of the internal annularrecess in said. coupling being equal to the thickness of said pieces.

9. In combination with a well strainer having supporting bars and wirewound and secured outside the bars in a helical formation, an endcoupling: piece having an internal annular recess receiving the ends ofthe bars in the internal bore thereof and arcuate reinforcing piecesextending; between sides of said bars, the depth of the internal annularrecess in said coupling being equal to the thickness of said pieces,said bars having external. threads, said internal annular recessedportion of said coupling having threads engaging the threads of saidbars.

10. In. combination: witha. well strainer having supporting bars. andwire wound and secured outsidethe bars. in a helical formation, an endcoupling piece having an internal annular recess receiving the ends ofthe bars inthe internal bore thereof and arcuate reinforcing piecesextending between sides of said bars, the depth of the internal annularrecess in said coupling being equal to the thickness of said pieces,said bars having external. threads, said internal annular recessedportionof said coupling having threads engaging the threads of saidbars, said coupling having a sleeve extending down over. the end turn ofsaid helically wound wire.

11. In. combination with a well strainer having. supporting bars andwire wound and secured outside the bars in a helical formation, an endcoupling piece. having an internal annular recess receiving the ends ofthe bars in the internal bore thereof and arcuate reinforcing piecesextending between sides of said bars,.the depth of the internal annularrecess in said coupling being equal to the thickness of said pieces,said bars having external threads, said internal annular recessedportion of said coupling having threads engaging. the threads of saidbars, said coupling having a sleeve extending down over the end turn ofsaid helically wound wire, and said parts sweated together intoaself-sustaining assembly.

12. In combination with a well strainer comprising bars spaced around acircle and having notches in their outer edges in helical series andWire helically disposed. and occupying the bar notches except notchesnear adjacent ends of the bars, a coupling having internal threadsscrewed into. said notches near said ends of the bars, and having aterminal. unthreaded sub stantially smooth sleeve. portion closelyembracing terminal portions of the wire to hold said terminal portionssecurely in the notches.

. GEORGE E. WILLERS.

